1 Corinthians 16:9 in the King James Version
For a great door and effectual is opened unto me, and there are many adversaries.
Context
8 But I will stay at Ephesus until Pentecost,
9 for a great and effective door has opened to me, and there are many adversaries.
10 Now if Timothy comes, see that he is with you without fear, for he does the work of the Lord, as I also do.